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Unread 02-27-2005, 09:23 PM   #1
boomhower
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Join Date: Feb 2005
Location: NJ
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RPM's drop quickly between shifts?

When I change gears on the road, the RPM's drop pretty quick (faster than normal) between shifts. What can I do to solve this problem? Was thinking it might be the TPS which might be causing my slight sputter. Will be replacing the TPS sometime soon. Hope it fixes the problem. Any other ideas?

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--1991 JEEP YJ 2.5l-- (trail beater)
RE 4". AA SYE. TW driveshaft. 33" TSL's. Snorkel. Olympic Rear Bumper. Warn XD9000i. Optima Yellow Top. Herculined Interior, Grill, and Rockers. TJ Flares. Cobra 19DX CB. Firestik antenna.
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Unread 02-27-2005, 09:29 PM   #2
OlllllllO Jeep1
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Not sure but it sounds like your clutch is slipping.
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Unread 02-27-2005, 09:36 PM   #3
JPH
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How does it idle, and does it drop faster than normal when you rev the engine without moving, or only when you are on the road and shifting gears?
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Unread 02-27-2005, 09:41 PM   #4
boomhower
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drops faster than normal without moving as well. idles a little bit low. sometimes it almost stalls but won't (thats after revving the engine up). i think it almost stalls due to the fact that the rpms drop so quickly, they just drop down to 0 and the engine would die.
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--1991 JEEP YJ 2.5l-- (trail beater)
RE 4". AA SYE. TW driveshaft. 33" TSL's. Snorkel. Olympic Rear Bumper. Warn XD9000i. Optima Yellow Top. Herculined Interior, Grill, and Rockers. TJ Flares. Cobra 19DX CB. Firestik antenna.
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Unread 02-27-2005, 10:08 PM   #5
JPH
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Location: B-Burg, Ky
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Troubleshoot a low idle and retarded timing. Look for vacuum leaks, (at gaskets and hoses), sensors, and maybe an idle adjustment on the linkage where it attaches to the throttle body looking thingy, (I think that is the technical term!), if you have MFI, or that is the throttle body if it is not MFI.
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Unread 02-27-2005, 10:15 PM   #6
CanukYJ
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It's probably crud caught in the throttle body plugging up the AIS motor and the bleed air hole which allows it to sustain idle and delay RPM drop. Get some -throttle body cleaner- and soak a bunch of it in there, then run the engine and while slightly reving it (enough to keep it moving, the cleaner will want to stall it) spray into the TB and the holes\galleys in it. That fixes alot of issues like this and it only takes 10mins, 3$, and if it doesn't work it didn't cost a ton and probably needed to be done anyways.
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